Carbureter.



G. M.v SCHEBLER.

CHBURETER.

l APPLICATION FILED FEB. 5| I9I2 RENIWED SEPT. 4, 1915. 1,156,823.,

Patent-d Oct.

R /lu UNITED sTATEs PATENT oEFIoE. ,A

GEORGE M. scIIEBLEE, or INDIANAPOLIS, INDIAN'A, 'AssIGNoE To FRANK II. WHEELER,

' or' INDIANAPOLIS, INDIANA.

CARBURETER.

Specification of Letters ilatent. Patented Oct. 12, 1915,

Application l'ed February 5, 1912, Serial No. 675,429. Renewed September 4, 1915. `Seria1 No. 49,121.

To all whom it may concern.'

Be it known that I, GEORGE M. SCHEBLER, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented a new and useful Carbureter, of which the following is a specification.

The object of my invention is to produce improvements in details of construction of a carbureter bymeans of which the delivery of fuel to the air may be improved in such manner as to-insure the most highly efficient character of mixture for varying speeds of the engine.

The accompanying drawings illustrate my invention. 4

Figure 1 is a central vertical section; Fig. 2 a sectional detail of'the needle valve support and adjacent parts on an enlarged scale; Fig. 3 a fragmentary detail showing diagramma-tically the manner of producing the air inlet nozzle; and Fig. 4 is an enlargement of-the needle valve.

y In the drawings, 10 indicates a bowl-like fuelchamber of substantially common form and provided with an inlet structure 11 through which the liquid fuel is delivered in desired quantities to chamber 10, the infiow of such fuel being controlled by means of a. float 12, or in any other desired manner. At

- its bottom, chamber 10 is perforated .at 13 and through this perforation is projected the lower end of a hollow stem 14 which is carried by the lower endof a main body 15 within which a mixing chamber or passage 16 is formed. ,4

Stem 14 is providedncar its lower end with a radially extending shoulder` 17 adapted to seat upon a packing gasket 18 arranged within chamber 10 around perforation 13. Surrounding the lower end 4of stem 14 is a primary air inlet structure 19 which is clamped inplace by means ofl a nut 19 threaded upon the lower end of stem14. The lower end of stem 14 is closed by a. readily removable threaded plug 20 so as t0 permit ready drainage of the settling chamber or sump 21 which is thus formed within the lower end of stem 14 'below chamber 10. Free communication between chamber 9 and the interior 22 of stem 14 above chamber 21 is had through passages 23, clearly indicated by dotted lines and the arrows in Fig. 1. Internally stem 14 is provided with a threaded portion 24 immediately above a shoulder 25, which defines the upper end of chamber 21, and threaded into these threads is a fuel nozzle 26 provided with a shoulder 27 at its lower end adapted to make aA tight joint with shoulder 25. Leading downwardly diagonally through the body of stem 14 are fuel passages 30' which thus form a communication between the lower part of chamber-10 and the upper part of sump v21. 4

The passage 22 is smaller in diameter at its middle than at its upper ends and communicates at its upper end -with the mixing chamber 16. The nozzle 26 'lies axially within the passage 22 and is provided with lateral passages 28 substantially in the plane of the smallest diameter of passage 22. Immediately below the passages 28, within the bore of' tube 26, I form an inwardly projecting'f'lange 29 having a well defined inner edge with which the tapered end of the needle valve 31 is to coperate but not to contact. The needle valve 31 is quiteslender but it is essential 4that. it be 'at all times centralized relative to the well defined upper edge of .the flange 29, because lateral vibrations -would ultimately result inf the Wearing of a groove around the tapered end of the valve and thus materially aHect the accuracy of adjustability of the valve relative to the flange. For this reason, the valve 31 immediately above its tapered lower end is caused to fit accurately the upper end 26 of the bore of nozzle 26, thus providing a snugly fitting `support for the valve stem immediately adjacent its tapered active end and thereby preventing all vpossibility of contact` between the tapered active end of the valve and the flange 29.v

In order to guard the stem 31 for the major portion of its length, thel lower end 32 of a protective tube 33 is sleeved over the upper end of tube 426 and this tube 33 is threaded at 34 into the base` 35 carried by a bracket-or'finger 36 depending from the upper wall of casing 15 into chamber 16. The 'tube 3 3 is bored to afford a loose fit for valve 31 so that the valve may be freely reciprocated vertically therethrough.

Valve 31 is provided at its upper end with a ball head 37 which is seated in -an inwardly presented cup 38 formed in a nut- '39 which is threaded into the lower'end of an adjusting screw 41, said screw having'an interior chamber 42 in which is mounted a soI l light spring 43 Which restsagainst the ball 37 so as to hold said ball in its cup 38. The adjusting screw 41 is threaded into the upper end of a chamber 44 formed within a vertically reciprocable block 45 which is mounted in the interior of a boss 46 carried by the upper Wall of casing 15. A light spring 47 acts upon block 45 to drive the same downwardly and this spring, as Well as the block, is held in place by a readily removable cap 48 which is threaded into the upper end of-boss 46. lPivoted at 51 within chamber 16 is a lever 52 whichcarries a yoke 53 pivoted to the lever on a pivot 54 at right angles to pivot v51 and providedat its ends with rollers or fingers 55, 55 which are projected under and into engagement with the lower end of block 45. The opposite end of lever 52 is provided with a roller or bear-. ing piece 56 which takes under a flange 57 carried by the stem 58 of the auxiliary air inlet valve 59. The stem 58 of valve 59 is centrally bored at 61 to receive a guide pin 62 on which fits a washer 63, between which and the lower end of stem 58, is mounted a spring'64 which normally urges the valve 58 upwardly against its seat65. The tension of spring 64 against the .valve 59 may be readily adjusted by means of a temper yscrew 66 which carries and is preferably integral with the guide pin 62 and is threaded through thelower Wall of casing 15 so as to form an adjustable abutment for Washer 63. This temper screw may be held in any desired position of adjustment by the set screw 67.

Stem 14 is provided with a flange 69 whichserves as a cover .for chamber 10, 4the chamber 10 being clamped against this flange by nut 19.

In the commercial manufacture of carbureters for general use, I have found that much difficulty is experienced by individual A users of carbureters where ordinary tests'of such carbureters indicate that they are properly designed to produce proper fuel miX- turesand such apparently erratic results have been a source of continual puzzle to as to its several parts so that it may be' manufactured. cheaply in large numbers, and yet so that it may be readily adapted for different types of engines, I have so constructed my present carbureter that, While 15 with a circular seat or socket 71 into which may be fitted an air inlet nozzle 72, which may be one of lany number of nozzles having different air passageways through them but-fitting such socket 71. Each of these nozzles is provided at its outer end with an inwardly projecting annular valve seat 65 against which the valve 59 normally rests. From this seat 65 inwardly the nozzle `72 is flared, or increased in diameter, as

shown at 7 3. The exact conformation of the flared portion 73 I determine empirically by attaching the carbureter to an engine of given type; running the same at different speeds and determining by experiment the space or air assage which should be had for the most e `cient miXture when the valve 59 is, by the suction of the engine at that particular speed, moved downwardly away from seat 65. I determine this shape of the nozzle 72 in several successive steps in the manner illustrated diagrammatically in Fig. 3 and the finished nozzle is then brought to an internal curved surface approximating the empirical determination. j

'By providing the main casing with a seat for the reception of .any desired air inlet nozzle, it will be seen that it is possible for me to produce a standard carbureter which may then be specially adaptedfor an engine of any particular manufacture or type by merely supplying the standard carbureter structure with the special air inlet nozzle which I find by experiment to be the best adapted to that particular type of engine.

It is, of course, desirable that the various parts of a carbureter be readily assembled and vdisassembled and to this end it will be noticed that the single nut 19 is so arranged that it holds Vboth the primary air inlet structure and the fuel reservoir in place With relation to themain body of the carbureter. A Water chamber 81 is shown formed around the outlet end of the mixture passage 16.

1 lene supplied through passages 28 past the valve 31 to give proper quantities of fuel to the air passing inwardly through the inlet structure 19. In all positions of adjustment the block 45 rests upon rollers 55 of lever 52. As Ithe speed of the engine is increased, valve 59 will be drawn downwardly against the action of spring -64 so as to admit an additional `qufa'nti% of air which must b'e supplied with a' su cient quantity of fuel by producing a richer mix-ture of fuel with the upwardly from the primary inlet 19 through the Apassage'22. The screw 41 will be ordinarily adjusted for the particular env gine towhich the vcarbureter is applied and for ordinary or average weather conditions this adjustment is not intended to be often changed. Under some unusual weather conditions, such an adjustment of the needle valve isfound to be too close to the seat 29 to supply an adequate quantity of fuel especially for starting the engine and in order to meet this diiliculty, I. have provided the pivot 51 at its ends with eccentric portions 82, 82, which are journaled in suitable bearings 83 formed in the side walls of casing 15 -and at the outer end of one of theseportions 82 I secure alever 84 by means of which the portions 82 may be rotated in their journals thus swinging the pivot 51 upwardly length- WiSe 0fthe vvalve 31and thus lifting the valve 31 from Aits seat but at all times maintaining the ends of lever 52 in engagement with flange 57 and block 45, respectively.

In order to prevent sudden fluctuations of valve 59 I provide a dash pot retarder therefor, comprising cylinder 91 and piston 92 which fits' the cylinder in such manner as to offer some slight lresistance to movement in either direction. Piston 92 is provided with a stem 93 which must fit the guiding bearing 94 tightly enough to prevent the passage Aof air to or from the cylinder. A rigid connection between stem 93 and valve .59 would require extreme accuracy of alinement of the cylinder and valve-support and would .thus make the cost of production commercially prohibitive. In order to avoid this diiliculty, therefore, I connect stem 93 to valve 59 by a free ball-and-socket joint 95 and then counterbore stem 58 so that only its lower end touches the guide pin 62. Cylinder 91 is carried by a cage or support 96 which may be threaded or otherwise secured to the upper end of any air-inlet nozzle 72 which may be attached to the carbureter. body.

I claim as my invention:

1. A carbureter comprising a main `hol-v low body forming la' mixture chamber and having a mixture outlet, an air inlet, and a depending tubular stem forming. a primary mixture inlet intermediate the said air inlet and mixture outlet and not in alinement therewith, a fuel nozzle arranged in said stem and having an upwardly directed discharge end with a needle valve seat formed therein, a needle valve projected downwardly into said seat, a carrier head for said needle valve, an axially adjustable connection between said carrier head and the needle Vvalve,an air valve arranged in the air inlet, and intermediate connections between the said air valve and theneedle valve head whereby opening'movement of the air valvel will produce proportioned opening movement of the needle valve.

2. A carbureter comprising a main ho'llow body forming a mixture chamber and having a mixture outlet, an air inlet, and a depending tubular stem forming a privmary mixture inlet intermediate the said air inlet and mixture outlet and not in alinement therewith, a fuel nozzle arranged in said stem and having an upwardly directed discharge end with a needle valve seatformed therein, aneedle valve projected downwardly into said seat, a carrier head for said 'needle valve, an air valve arranged in the air inlet, and intermediate connections between the said air valve and the needle valve head whereby opening Amovement of the air valve will produce proportioned opening movementv of the needle valve.

3. A carbureter Icomprising a main hollow body having an air inlet, a mixture outlet, ,and a depending tubular stem forming a primary mixture inlet, a fuel nozzle arranged within said tubular stem and communicating with a fuel sump therein, a fuel reservoir surrounding said depending stem and communicating with the fuel nozzle by passages extending from the fuel reservoir to said sump, a primary air inlet structure sleevedI upon the ldepending' stem and communicating with'the interior thereof, and a clamping nut threaded upon the said stem and clamping both the primary air inlet structure and the fuel reservoir in place upon the stem.

4. In a carbureter, a fuel nozzle having a discharge outlet and a needle valve seat adjacent said outlet, a needle valve associated with said valve seat and extending above the same, ahead to which said needle valve is flexibly connected, and a tubular guard surrounding said needle valve for the ma,-

jor portion of its length above the valve seat,

relative to the head and the valve seat, an

air valve associated with the air inlet, a. le.

ver connecting the air valve and fuel valve head, and a rotatable eccentric support for the fulcrum of said lever whereby the valve may be adjusted relative to its seat independent of the connection between the valve and the valve carrying head.

6. A carbureter comprising a main hollow body forming a mixture chamber having an air inlet, a mixture outlet, and having a primary mixture inlet passage intermediate the air inlet and the mixture outlet, a fuel nozzle arranged withinsaid primary mixture inlet passage, a valve associated with said fuel nozzle, a head carrying said valve, a connection between said head and valve whereby the valve may be adjusted relative to the head and the valve seat, an air valve associated with the air inlet, a lever connecting the air valve and fuel valve head, and means for adjusting the fulcrum of said lever axially of the fuel valve whereby the fuel valve may be adjusted relative'to its seat by movement of the lever fulcrum independent of the connection between the valve and the valve carrying head.

7. In a earbureter, the combination with a casing having an air inlet and a fuel inlet, with corresponding air and fuel valves,

position of the lever, and 'vice versa when the lever swings in the opposite direction it opens proportionally less.

8. In a carbureter, a fuel nozzle having a Idischarge outlet and a needle valve seat adjacent said outlet, a needle valve associated with said valve seat and extending;

above the same, a head to which said needle valve is fiexibly connected, and a tubular, guard surrounding said needle valve for the major portion of its length above the valvey seat but spaced from said needle valve save near the point of the latter.

In witness whereof, I have hereunto set my hand and seal at Indianapolis, Indiana,

this l'st day of February, A. D. one thousand ninehundred and twelve.

GEORGE M. soHEBLER. [LQ aj.

Witnesses ARTHUR M. Hoon, MAYy LAYDEN. 

